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No funding was received for the expressed purpose of writing this paper, and the funding source had no direct involvement or oversight of the preparation of this paper.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Funding"}},{"value":"ZYK reports grants from the National Football League (NFL) during the conduct of this study as well as grants from the Centers for Disease Control and Prevention (CDC), U.S. Department of Defense (DoD), and National Institutes of Health. BLB acknowledges support from the National Institute of Neurological Disorders and Stroke under the NIH under the award NO L30NS113158-01. AC receives funding from the National Collegiate Athletics Association (NCAA) as Director of the NCAA Injury Surveillance Program. MM reports a grant from NFL during the conduct of the study as well as grants from NIH, CDC, DoD, and NCAA outside the submitted work. WPM receives royalties from (1) ABC-Clio publishing for the sale of his books, <i>Kids, Sports, and Concussion: A guide for coaches and parents,<\/i> and <i>Concussions;<\/i> (2) Springer International for the book <i>Head and Neck Injuries in Young Athlete<\/i>; and (3) Wolters Kluwer for working as an author for <i>UpToDate<\/i>. His research is funded, in part, by philanthropic support from the National Hockey League Alumni Association through the Corey C. Griffin Pro-Am Tournament and a grant from the NFL. RJE is a paid consultant for the National Hockey League (NHL) and co-chair of the NHL\/NHL Players\u2019 Association Concussion Subcommittee. He is also a paid consultant for Major League Soccer, the US Soccer Federation, and Princeton University Athletic Medicine and he occasionally provides expert testimony in matters related to mild traumatic brain injury and sports concussion. The other authors have no conflicts of interest to declare.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflicts of Interest\/Competing Interests"}},{"value":"This study was approved by the Institutional Review Board at the University of North Carolina at Chapel Hill.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics Approval"}},{"value":"All participants provided informed consent prior to completing the study procedures.","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to Participate"}},{"value":"The authors affirm that human research participants provided informed consent for publication of the data presented in this study.","order":6,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for Publication"}},{"value":"Data are not publicly available. Code used for study analyses may be made available upon reasonable request to the corresponding author.","order":7,"name":"Ethics","group":{"name":"EthicsHeading","label":"Code availability"}},{"value":"Data are not publicly available.","order":8,"name":"Ethics","group":{"name":"EthicsHeading","label":"Availability of Data and Material"}},{"value":"Dr. Samuel R. Walton: creation and distribution of the study questionnaire, management of study database, established research hypotheses, planned analyses of the data, interpretation of study findings, manuscript preparation and revision, final approval of the submitted manuscript. Dr. Zachary Y. Kerr: creation and distribution of the study questionnaire, management of study database, established research hypotheses, planned analyses of the data, interpretation of study findings, manuscript preparation and revision, final approval of the submitted manuscript. Dr. Rebekah Mannix: established research hypotheses, interpretation of study findings, manuscript preparation and revision, final approval of the submitted manuscript. Dr. Benjamin L. Brett: creation and distribution of the study questionnaire, management of study database, established research hypotheses, planned analyses of the data, interpretation of study findings, manuscript preparation and revision, final approval of the submitted manuscript. Dr. Avinash Chandran: creation and distribution of the study questionnaire, management of study database, established research hypotheses, planned analyses of the data, interpretation of study findings, manuscript preparation and revision, final approval of the submitted manuscript. Dr. J. D. DeFreese: creation and distribution of the study questionnaire, interpretation of study findings, manuscript preparation and revision, final approval of the submitted manuscript. Dr. Michael McCrea: creation and distribution of the study questionnaire, interpretation of study findings, manuscript preparation and revision, final approval of the submitted manuscript. Dr. Kevin M. Guskiewicz: creation and distribution of the study questionnaire, interpretation of study findings, manuscript preparation and revision, final approval of the submitted manuscript. Dr. William P. Meehan III: creation and distribution of the study questionnaire, interpretation of study findings, manuscript preparation and revision, final approval of the submitted manuscript. Dr. Ruben J. Echemendia: creation and distribution of the study questionnaire, established research hypotheses, planned analyses of the data, interpretation of study findings, manuscript preparation and revision, final approval of the submitted manuscript. Other contributors to the project are as follows (included in Acknowledgements): Hope Campbell: assisted in the creation and distribution of the study questionnaire and in the collection and management of the questionnaire responses. Assisted with oversight of the project administration and execution. Candice Goerger, Project Administrator: assisted in the creation and distribution of the questionnaire instrument as well as collection and management of the questionnaire responses. Additionally, she was responsible for overseeing the project administration and execution. Caprice Hunt, Project Coordinator (University of North Carolina at Chapel Hill): assisted in the creation and distribution of the questionnaire, oversight of the project administration, and execution of the study. Greggory Kobelski: assisted in oversight of the project administration, and execution of the study. Danielle Hunt: assisted in oversight of the project administration, and execution of the study. Becky Parmeter: assisted in oversight of the project administration, and execution of the study. Alexa Wild: assisted in oversight of the project administration, and execution of the study.","order":9,"name":"Ethics","group":{"name":"EthicsHeading","label":"Authors\u2019 Contributions"}}]}}